Question

(a) In a chemical reaction 3 moles of A(g) and 2 moles of B(g) react to form 4 moles of C(g) and 1 mole of D(g). Would you expect DS to be positive, negative, or close to zero for this reaction? DS for this reaction should . (b) In which of the processes described below should the entropy increase? Choose all of the correct possibilities. ice cubes melting at -5 oC and 1 atm pressure a spark causes hydrogen and oxygen gases mixed in a balloon to react explosively breakdown of large molecules into smaller ones during digestion of a meal the reaction of sodi

Answer 1

3 A (g) + 2 B (g) -------> 4 C (g) + D (g)

number of moles of reactants = number of moles of products

dS = +ve ( if dS produts - dS reactants is positive) or Zero (if dS products = dS reactants)

ice cubes melting at -5 oC and 1 atm pressure dS = negative because at that temperature ice will formed so orderness increases hence dS = ds products - dS reacatants = -ve

hydrogen and oxygen gases mixed in a balloon to react explosively breakdown of large molecules into smaller ones. dS = dS products - dS reactants = +ve

Since explosively large molecules converted into smaller molecules disorderness increases so dS = +ve.